Quantitative feed liquid conveying device and quantitative radioactive feed liquid conveying method

Abstract

The invention discloses a quantitative feed liquid conveying device and a quantitative radioactive feed liquid conveying method, which can calibrate a metering pump to realize quantitative conveying and avoid feed liquid crystallization. The quantitative feed liquid conveying device comprises a feed storage tank (4), a metering pump, a discharge pipe (13), a flow calibration assembly and a heating assembly. The flow calibration assembly is used for calibrating the flow of the metering pump so as to determine the set operation time of the metering pump; the flow calibration assembly comprises a liquid level meter, a feed liquid circulating pipe (12) and a flow calibration storage tank (6). And the heating assembly is used for heating feed liquid in the feed storage tank (4), the discharge pipe (13), the feed liquid circulating pipe (12) and the flow calibration storage tank (6). And after the flow calibration of the metering pump is finished, the metering pump operates according to the set operation time, so that the feed liquid quantitative conveying device pumps the feed liquid with the preset volume through the discharge pipe (13).

Description

Technical Field

[0001] The invention belongs to the technical field of liquid feed transportation, and in particular relates to a liquid feed quantitative transportation device and a radioactive liquid feed quantitative transportation method. Background Art

[0002] In the fields of chemical industry, pharmaceutical industry, nuclear power, nuclear chemical industry, etc., it is often necessary to quantitatively transport liquid. At present, metering pumps are mainly used for quantitative transportation.

[0003] However, during the use of the metering pump, the flow rate delivered by the metering pump may change due to external environmental factors or different types of liquids, which will affect the delivery accuracy of the metering pump and make it difficult to achieve the purpose of quantitative delivery.

[0004] Moreover, when faced with a liquid feed that is easy to crystallize (for example, a material with a high solute content after concentration), the liquid feed may crystallize during transportation and block the transportation equipment and pipelines. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a quantitative liquid delivery device and a quantitative liquid delivery method for radioactive liquid, which can calibrate the metering pump to achieve quantitative delivery and avoid liquid crystallization.

[0006] In the first aspect, an embodiment of the present invention provides a quantitative liquid delivery device, which includes a feed storage tank, a metering pump, a discharge pipe, a flow calibration component and a heating component. The feed storage tank is used to store the feed liquid. The metering pump is arranged on the feed storage tank and is used to pump the feed liquid. The discharge pipe is connected to the metering pump and is used to guide the feed liquid in the feed storage tank. The flow calibration component is used to calibrate the flow of the metering pump to determine the set running time of the metering pump. The flow calibration component includes a liquid level meter, a liquid circulation pipe and a flow calibration storage tank; the liquid level meter is arranged in the feed storage tank and is used to detect the liquid level of the liquid in the feed storage tank; one end of the liquid circulation pipe is connected to the discharge pipe, and the other end is connected to the inside of the feed storage tank; the flow calibration storage tank is arranged on the liquid circulation pipe, and is used to temporarily store the liquid pumped by the metering pump when calibrating the flow of the metering pump, and to return the temporarily stored liquid to the feed storage tank after the calibration. The heating component is used to heat the liquid in the feed tank, the discharge pipe, the liquid circulation pipe, and the flow calibration tank. After the flow calibration of the metering pump is completed, the metering pump runs according to the set running time, so that the liquid quantitative delivery device pumps a preset volume of liquid through the discharge pipe.

[0007] In some embodiments, the heating assembly includes a plurality of insulation jackets, a heating tank and a heating pump. The plurality of insulation jackets are respectively arranged on the outside of the feed storage tank, the discharge pipe, the liquid circulation pipe, and the flow calibration storage tank. The heating tank is connected to the insulation jacket through a connecting pipe, which is used to heat the heating medium in the heating tank. The heating pump is arranged on the connecting pipe, which is used to transport the heating medium in the heating tank to each of the insulation jackets, so as to heat the liquid in the feed storage tank, the discharge pipe, the liquid circulation pipe, and the flow calibration storage tank respectively through the heating medium.

[0008] In some embodiments, each of the heat-insulating jackets has a liquid return port, and the liquid return ports are connected to the heating tank. After the heating medium is transported into each of the heat-insulating jackets, it flows back into the heating tank from the liquid return port of each of the heat-insulating jackets.

[0009] In some embodiments, an overflow pipe is further provided on the flow calibration storage tank, the first end of the overflow pipe is connected to the upper part of the flow calibration storage tank, and the second end is connected to the liquid circulation pipe located between the flow calibration storage tank and the feed storage tank. A plurality of insulation jackets are also provided on the outside of the overflow pipe; the heating pump is also used to transport the heating medium to the insulation jacket outside the overflow pipe, so as to heat the liquid in the overflow pipe through the heating medium.

[0010] In some embodiments, the liquid quantitative delivery device further comprises a calculation unit. The calculation unit is electrically connected to the liquid level meter, and is used to obtain the total amount of liquid pumped by the metering pump according to the liquid level change of the liquid level meter during the process of calibrating the flow rate of the metering pump, and calculate the flow rate of the metering pump in combination with the running time of the metering pump, and calculate the set running time of the metering pump according to the preset capacity of the liquid to be pumped by the liquid quantitative delivery device and the flow rate of the metering pump.

[0011] In some embodiments, the quantitative liquid delivery device further includes a valve assembly. The valve assembly includes a first valve, a second valve and a third valve; the first valve is arranged on the discharge pipe and located at the rear end of the liquid circulation pipe, and is used to control the on-off of the discharge pipe; the second valve is arranged on the first section of the liquid circulation pipe, the first section of the liquid circulation pipe is between the flow calibration storage tank and the discharge pipe, and the second valve is used to control the on-off of the first section of the liquid circulation pipe; the third valve is arranged on the second section of the liquid circulation pipe, the second section of the liquid circulation pipe is between the flow calibration storage tank and the feed storage tank, and the third valve is used to control the on-off of the second section of the liquid circulation pipe. A plurality of the insulation jackets are also arranged on the outside of the first valve, the second valve and the third valve, and the heating pump is also used to transport the heating medium to the insulation jackets outside the first valve, the second valve and the third valve, so as to heat the liquid in the first valve, the second valve and the third valve respectively through the heating medium.

[0012] In some embodiments, the quantitative liquid delivery device also includes a controller. The controller is electrically connected to the first valve, and is used to control the opening of the discharge pipe according to the first control signal received from the outside world, so as to discharge the liquid to the outside. The controller is also electrically connected to the second valve, and is used to control the opening of the first section of the liquid circulation pipe according to the second control signal received from the outside world, so that when the flow of the metering pump is calibrated, the liquid pumped by the metering pump is transported to the flow calibration storage tank through the first section of the liquid circulation pipe for temporary storage. The controller is also electrically connected to the third valve, and is used to control the opening of the second section of the liquid circulation pipe according to the third control signal received from the outside world, so that after the flow of the metering pump is calibrated, the liquid temporarily stored in the flow calibration storage tank is refluxed to the feed storage tank through the second section of the liquid circulation pipe.

[0013] In some embodiments, the feed liquid is a radioactive feed liquid. The feed storage tank is arranged in the first shielding room, the flow calibration storage tank is arranged in the second shielding room, the first valve, the second valve and the third valve are arranged in the third shielding room, and the heating tank and the heating pump are arranged in the equipment room. Among the first shielding room, the second shielding room, the third shielding room and the equipment room, the height of the first shielding room is higher than the heights of the other three, and the height of the equipment room is lower than the heights of the other three.

[0014] In some embodiments, the metering pump is a plunger metering pump. The metering pump includes a power end, a pump core and a hydraulic end. The power end is arranged in a maintenance room. One end of the pump core is connected to the power end, and the other end is connected to the hydraulic end after passing through the shielding plate of the first shielding room. The hydraulic end is arranged in the feed tank. The power end drives the hydraulic end to move through the pump core, so as to pump the liquid through the hydraulic end.

[0015] In some embodiments, the pump core includes an outer sleeve and a connecting rod. One end of the outer sleeve is fixed to the power end, and the other end is fixed to the outer wall of the feed tank after passing through the shielding plate of the first shielding room. The connecting rod is arranged in the outer sleeve, and the two ends of the connecting rod are respectively connected to the power end and the hydraulic end; the power end drives the hydraulic end to move through the connecting rod, so as to pump the liquid through the hydraulic end.

[0016] In some embodiments, the liquid quantitative delivery device further includes an emptying component. The emptying component includes a dilution tube, a steam jet pump, and an emptying tube. The dilution tube is connected to the interior of the feed tank and is used to deliver the dilution liquid into the feed tank. The steam jet pump is disposed on the feed tank, and the suction port of the steam jet pump is disposed at the bottom of the feed tank, and is used to pump the liquid in the feed tank to the outside through the emptying tube. The emptying tube is connected to the discharge port of the steam jet pump and is used to discharge the liquid pumped by the steam jet pump to the outside.

[0017] Therefore, the quantitative liquid delivery device provided by the embodiment of the present invention can guide the liquid in the feed storage tank to the discharge pipe for delivery by setting a metering pump and a discharge pipe. By setting a liquid level meter in the feed storage tank, the liquid level of the liquid in the feed storage tank can be detected. After setting a liquid circulation pipe and a flow calibration storage tank, one end of the liquid circulation pipe is connected to the discharge pipe, and the other end is connected to the inside of the feed storage tank. The flow calibration storage tank is set on the liquid circulation pipe. When calibrating the flow of the metering pump, the flow calibration storage tank can be used to temporarily store the liquid pumped by the metering pump, and after the calibration is completed, the temporarily stored liquid is returned to the feed storage tank, thereby realizing the calibration of the flow of the metering pump, so as to determine the set running time of the metering pump according to the preset capacity of the liquid, and avoid the waste of liquid. After the flow calibration of the metering pump is completed, the metering pump is operated for the above-mentioned set running time, so that the quantitative liquid delivery device can pump the preset capacity of liquid through the discharge pipe, and realize the quantitative delivery function of the quantitative liquid delivery device. By setting up a heating component, the liquid in the feed tank, the discharge pipe, the liquid circulation pipe, and the flow calibration tank can be heated by the heating component to avoid crystallization of the liquid, thereby making the liquid quantitative conveying device suitable for conveying liquid that is easy to crystallize.

[0018] In a second aspect, an embodiment of the present invention further provides a method for quantitatively conveying a radioactive liquid feed, using the liquid feed quantitative conveying device in the first aspect, the method for quantitatively conveying the liquid feed comprising: starting a heating component to heat the liquid feed in a feed tank, a discharge pipe, a liquid feed circulation pipe, and a flow calibration tank; the metering pump operates for a first time to pump the liquid feed in the feed tank to the flow calibration tank for temporary storage through the liquid feed circulation pipe; the volume of the liquid feed pumped by the metering pump within the first time is obtained through a liquid level meter in the feed tank to calibrate the flow rate of the metering pump; the liquid feed temporarily stored in the flow calibration tank is refluxed into the feed tank; according to the first volume of the liquid feed that needs to be discharged by the liquid feed quantitative conveying device, a second time that the metering pump needs to operate is calculated; the metering pump operates for a second time to discharge a preset volume of liquid feed through the discharge pipe.

[0019] In some embodiments, the temperature t1 of the slurry satisfies 80°C≤t1≤85°C.

[0020] The method for quantitatively conveying radioactive liquid provided in the embodiment of the present invention has the same beneficial effects as the above-mentioned device for quantitatively conveying radioactive liquid, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 : A structural diagram of a liquid quantitative conveying device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0023] Embodiment 1:

[0024] like Figure 1 As shown, an embodiment of the present invention provides a liquid quantitative conveying device, which is applied to a liquid conveying process and is used for quantitative conveying of liquid that is easy to crystallize.

[0025] like Figure 1 As shown, the liquid quantitative conveying device includes a feed storage tank 4, a metering pump, a discharge pipe 13, a flow calibration component and a heating component.

[0026] The feed tank 4 is used to store the feed liquid. The metering pump is arranged on the feed tank 4 and is used to pump the feed liquid. The feed tank 4 may be cylindrical in shape. The discharge pipe 13 is connected to the metering pump and is used to discharge the feed liquid from the feed tank 4.

[0027] Exemplarily, the feed storage tank 4 is fixed on the equipment bracket, and the feed liquid is a low-temperature easily crystallizable feed liquid (such as a solution with a solute concentration close to saturation), or the feed liquid can also be an ordinary feed liquid (i.e. a conventional feed liquid that is not easy to crystallize).

[0028] A metering pump is a type of fluid delivery equipment. Its outstanding feature is that it can maintain a constant flow rate regardless of the discharge pressure. The use of a metering pump can simultaneously complete the functions of delivery, metering and regulation, thereby simplifying the production process.

[0029] Exemplarily, the metering pump in this embodiment is an immersed vertical pump.

[0030] When the metering pump is in operation, the liquid in the feed tank 4 is pumped out and transported to the target location through the discharge pipe 13 .

[0031] like Figure 1 As shown, the flow calibration component is used to calibrate the flow of the metering pump to determine the set running time of the metering pump. The flow calibration component includes a liquid level meter, a liquid circulation pipe 12 and a flow calibration storage tank 6. The liquid level meter is arranged in the feed storage tank 4, and is used to detect the liquid level of the liquid in the feed storage tank 4; one end of the liquid circulation pipe 12 is connected to the discharge pipe 13, and the other end is connected to the inside of the feed storage tank 4. The flow calibration storage tank 6 is arranged on the liquid circulation pipe 12, and is used to temporarily store the liquid pumped by the metering pump when calibrating the flow of the metering pump, and to return the temporarily stored liquid to the feed storage tank 4 after the calibration is completed.

[0032] Exemplarily, the above-mentioned liquid level meter can be an air-blowing liquid level meter. In addition to being able to measure the liquid level of clean liquids, the air-blowing liquid level meter is also suitable for measuring the liquid level of corrosive acid, alkali, and salt liquids, liquids with high viscosity, liquids that are easy to crystallize, high temperature, liquids containing solid particles, and some fluidized bed material levels, and can meet the measurement of the liquid level of the feed tank 4.

[0033] Exemplarily, the liquid circulation pipe 12 includes a first section of the liquid circulation pipe and a second section of the liquid circulation pipe. The first section of the liquid circulation pipe is used to connect the flow calibration tank 6 and the discharge pipe 13, and the second section of the liquid circulation pipe is used to connect the flow calibration tank 6 and the feed tank 4.

[0034] Exemplarily, the height of the flow calibration tank 6 is higher than that of the feed tank 4 , so as to facilitate the liquid in the feed tank 4 to flow back into the feed tank 4 due to its own gravity.

[0035] The working process of the flow calibration component is as follows:

[0036] S1, record the initial liquid level of the feed liquid in the feed storage tank 4;

[0037] S2, start the metering pump, and the metering pump pumps part of the liquid through the discharge pipe 13 and the first section of the liquid circulation pipe to the flow calibration storage tank 6;

[0038] S3, stop the metering pump, record the final liquid level of the feed liquid in the feed storage tank 4, and calculate the flow rate of the metering pump in combination with the initial liquid level of the feed liquid in the feed storage tank 4 and the running time of the metering pump to complete the calibration of the flow rate of the metering pump;

[0039] S4, the feed liquid temporarily stored in the flow calibration storage tank 6 is returned to the feed liquid circulation pipe 12 through the second section of the feed liquid circulation pipe.

[0040] The flow calibration component can be used to calibrate the flow of the metering pump and avoid waste of liquid during the calibration process.

[0041] like Figure 1 As shown, the heating component is used to heat the feed liquid in the feed tank 4, the discharge pipe 13, the feed liquid circulation pipe 12, and the flow calibration tank 6.

[0042] Exemplarily, the type of the heating component can be electric heating or heating by a heat transfer medium, so that the slurry can be maintained at a higher temperature (above the crystallization temperature).

[0043] Exemplarily, the heating component can keep the temperature of the liquid in the liquid quantitative conveying device above the crystallization temperature to prevent the liquid from crystallizing and clogging the equipment (such as a metering pump, etc.) and pipelines (such as a discharge pipe 13, etc.) in the liquid quantitative conveying device.

[0044] For example, if the crystallization temperature of the liquid in the liquid quantitative conveying device is 70°C, the heating component is used to maintain the temperature of the liquid at 75°C.

[0045] Through the above arrangement, the liquid quantitative conveying device can be used to convey liquid that is easy to crystallize.

[0046] After the flow calibration of the metering pump is completed, the metering pump runs according to the above-mentioned set running time, so that the liquid quantitative conveying device pumps a preset volume of liquid through the discharge pipe 13.

[0047] After the metering pump is calibrated, the flow rate of the metering pump can be obtained. When it is necessary to transport a preset volume of liquid to the outside through the discharge pipe 13, the time required for the metering pump to run can be obtained by dividing the preset volume by the flow rate of the metering pump, and this time is the set running time.

[0048] After the metering pump runs for a set running time, the liquid quantitative conveying device can pump a preset volume of liquid through the discharge pipe 13, thereby realizing the quantitative conveying function of the liquid quantitative conveying device.

[0049] For example, the cross-sectional area of ​​the feed tank is 3m 2 During the flow calibration of the metering pump, the liquid level of the level meter changes by 1m. In this process, the volume of the liquid pumped by the metering pump is 3m 3If the running time of the metering pump is 1min during this process, the flow rate of the metering pump can be calculated to be 3m 3 / min.

[0050] After the flow rate of the metering pump is calibrated, if the preset volume of the liquid to be pumped by the liquid quantitative delivery device is 6m 3 , it can be calculated that the set running time of the metering pump is 2 minutes.

[0051] Therefore, the quantitative liquid delivery device provided by the embodiment of the present invention can guide the liquid in the feed tank 4 to the discharge pipe 13 for delivery by the metering pump by setting the metering pump and the discharge pipe 13. By setting the liquid level meter in the feed tank 4, the liquid level of the liquid in the feed tank 4 can be detected. After setting the liquid circulation pipe 12 and the flow calibration tank 6, one end of the liquid circulation pipe 12 is connected to the discharge pipe 13, and the other end is connected to the inside of the feed tank 4. The flow calibration tank 6 is set on the liquid circulation pipe 12. When calibrating the flow of the metering pump, the flow calibration tank 6 can temporarily store the liquid pumped by the metering pump, and after the calibration is completed, the temporarily stored liquid is returned to the feed tank 4, thereby realizing the calibration of the flow of the metering pump, so as to determine the set running time of the metering pump according to the preset capacity of the liquid, and avoid the waste of liquid. After the flow calibration of the metering pump is completed, the metering pump is run for the set running time, so that the liquid quantitative conveying device can pump a preset volume of liquid through the discharge pipe 13, thereby realizing the quantitative conveying function of the liquid quantitative conveying device. By setting a heating component, the liquid in the feed tank 4, the discharge pipe 13, the liquid circulation pipe 12, and the flow calibration tank 6 can be heated by the heating component to avoid crystallization of the liquid, so that the liquid quantitative conveying device can be suitable for conveying liquid that is easy to crystallize.

[0052] In some embodiments, Figure 1 As shown, the heating assembly includes a plurality of insulation jackets, a heating tank 7 and a heating pump 8. The plurality of insulation jackets are respectively arranged on the outside of the feed tank 4, the discharge pipe 13, the liquid circulation pipe 12, and the flow calibration tank 6. The heating tank 7 is connected to the insulation jacket through a connecting pipe 15, which is used to heat the heating medium in the heating tank 7. The heating pump 8 is arranged on the connecting pipe 15, which is used to transport the heating medium in the heating tank 7 to each insulation jacket, so as to heat the liquid in the feed tank 4, the discharge pipe 13, the liquid circulation pipe 12, and the flow calibration tank 6 respectively through the heating medium.

[0053] Exemplarily, the heat-insulating jacket is arranged outside the feed tank 4, the discharge pipe 13, the liquid circulation pipe 12, and the flow calibration tank 6. A heating channel for the heating medium to pass through is formed inside the heat-insulating jacket.

[0054] The insulating jacket can be a separately arranged component; alternatively, the material storage tank 4, the discharge pipe 13, the material liquid circulation pipe 12, and the flow calibration storage tank 6 are all in the form of jacketed pipes, and the insulating jacket is directly formed in the jacketed pipes of the material storage tank 4, the discharge pipe 13, the material liquid circulation pipe 12, and the flow calibration storage tank 6.

[0055] When the heating pump 8 is started, the heating medium in the heating tank 7 is transported to the heating channel of the insulation jacket through the connecting pipe 15, so that the heating medium heats the feed liquid in the feed tank 4, the discharge pipe 13, the feed liquid circulation pipe 12, and the flow calibration tank 6.

[0056] Exemplarily, the heating medium may be a fluid such as hot water. The temperature of the heating medium needs to be set according to the type of the feed liquid to ensure that the heating medium can maintain the temperature of the feed liquid above the crystallization temperature to prevent the feed liquid from crystallizing.

[0057] For example, the crystallization temperature of the feed liquid is 50°C. Considering the loss in the heat transfer process on the heating medium, the temperature of the heating medium can be set to 55°C, 60°C or 65°C, etc.

[0058] It can be understood that the insulation jacket also has a heat preservation function, which can reduce the heat loss of the feed liquid and is conducive to ensuring that the feed liquid is always in a non-crystallized state during the transportation and flow calibration process.

[0059] Exemplarily, the connecting pipe 15 may include a plurality of pipes arranged in parallel, so as to transport the heating medium to each insulation jacket respectively through the plurality of pipes.

[0060] Through the above arrangement, the feed liquid in the feed tank 4, the discharge pipe 13, the feed liquid circulation pipe 12, and the flow calibration tank 6 can be heated respectively by the heat-insulating jacket.

[0061] In some embodiments, Figure 1 As shown, each insulation jacket has a liquid return port, and the liquid return port is connected to the heating tank 7. After the heating medium is transported to each insulation jacket, it flows back to the heating tank 7 from the liquid return port of each insulation jacket.

[0062] like Figure 1 As shown, each liquid return port is converged to the reflux pipe 16 through a shunt pipe. The heating medium in each insulation jacket flows back to the heating tank 7 through the reflux pipe 16 for heating and temperature rise, and circulates between the insulation jacket and the heating tank 7 under the drive of the heat pump 8.

[0063] Through the above arrangement, the heating medium can be continuously heated by the heating tank 7 and then circulated in each insulation jacket to continuously heat the feed liquid, keep the feed liquid temperature above the crystallization temperature, and keep the feed liquid in a non-crystallized state.

[0064] In some examples, the quantitative liquid conveying device also includes multiple temperature sensors, which are respectively arranged at the outlet of the discharge pipe 13, the connecting pipe 15 in the heating component and the return pipe 16, so as to simultaneously measure the outlet of the discharge pipe 13, the water supply temperature and the return water temperature of the heating component, so as to grasp the temperature of the entire quantitative liquid conveying device during operation, ensure that the liquid inside it is at the set temperature, and ensure that the liquid does not crystallize.

[0065] In some embodiments, an overflow pipe 14 is further provided on the flow calibration storage tank 6. The first end of the overflow pipe 14 is connected to the upper part of the flow calibration storage tank 6, and the second end is connected to the liquid circulation pipe 12 (i.e., the second section of liquid circulation pipe described below) located between the flow calibration storage tank 6 and the feed storage tank 4. A plurality of insulation jackets are also provided on the outside of the overflow pipe 14; the heating pump 8 is also used to transport the heating medium to the insulation jacket outside the overflow pipe 14, so as to heat the liquid in the overflow pipe 14 through the heating medium.

[0066] Exemplarily, the flow calibration storage tank 6 adopts a flat top and flat bottom structure, and the flow calibration storage tank 6 is provided with a feed liquid inlet, an overflow port and a lower reflux port. The first end of the overflow pipe 14 is connected to the overflow port, the first section of the feed liquid circulation pipe is connected to the feed liquid inlet, and the second section of the feed liquid circulation pipe is connected to the lower reflux port.

[0067] When the liquid level in the flow calibration storage tank 6 is higher than the overflow port, the liquid above the overflow port will overflow into the second section of the liquid circulation pipe through the overflow pipe 14, and finally flow back to the feed storage tank 4, thereby preventing the liquid from overflowing from the flow calibration storage tank 6.

[0068] Exemplarily, the thermal insulation jacket may be a separately provided component; or, the overflow pipe 14 also takes the form of a jacketed pipe, and the thermal insulation jacket is directly formed on the overflow pipe 14 .

[0069] Through the above arrangement, it is possible to avoid the liquid in the flow calibration tank 6 from being drawn out, and to heat the liquid in the overflow pipe 14 to keep the liquid in the overflow pipe 14 in a non-crystallized state.

[0070] In some embodiments, Figure 1 As shown, the liquid quantitative conveying device further includes a calculation unit. The calculation unit is electrically connected to the liquid level meter, and is used to obtain the total amount of liquid pumped by the metering pump according to the liquid level change of the liquid level meter during the flow rate calibration of the metering pump, and calculate the flow rate of the metering pump in combination with the running time of the metering pump, and calculate the set running time of the metering pump according to the preset capacity of the liquid to be pumped by the liquid quantitative conveying device and the flow rate of the metering pump.

[0071] Exemplarily, the above-mentioned liquid level meter is a liquid level meter with a remote transmission function.

[0072] For example, the computing unit may be a general-purpose microprocessor with computing functions. The computing unit is arranged in the control cabinet 10 .

[0073] Through the above arrangement, the flow rate and set running time of the metering pump can be automatically calculated by the calculation unit, thereby reducing the calculation workload of the staff.

[0074] In some embodiments, the liquid quantitative delivery device further includes a valve assembly. The valve assembly includes a first valve A1, a second valve A2 and a third valve A3; the first valve A1 is arranged on the discharge pipe 13 and located at the rear end of the liquid circulation pipe 12, and is used to control the on-off of the discharge pipe 13; the second valve A2 is arranged on the first section of the liquid circulation pipe, the first section of the liquid circulation pipe is between the flow calibration storage tank 6 and the discharge pipe 13, and the second valve A2 is used to control the on-off of the first section of the liquid circulation pipe; the third valve A3 is arranged on the second section of the liquid circulation pipe, the second section of the liquid circulation pipe is between the flow calibration storage tank 6 and the feed storage tank 4, and the third valve A3 is used to control the on-off of the second section of the liquid circulation pipe. A plurality of insulation jackets are also arranged on the outside of the first valve A1, the second valve A2 and the third valve A3, and the heating pump 8 is also used to transport the heating medium to the insulation jackets on the outside of the first valve A1, the second valve A2 and the third valve A3, so as to heat the liquid in the first valve A1, the second valve A2 and the third valve A3 respectively through the heating medium.

[0075] The opening and closing conditions of the first valve A1, the second valve A2 and the third valve A3 are as follows:

[0076] In the initial state, the first valve A1 , the second valve A2 and the third valve A3 are all in a closed state.

[0077] When calibrating the flow rate of the metering pump, the first valve A1 is closed, the second valve A2 is opened, and the third valve A3 is closed. The liquid pumped by the metering pump passes through the discharge pipe 13 and the first section of the liquid circulation pipe into the flow calibration storage tank 6 for temporary storage.

[0078] After the flow rate of the metering pump is calibrated, the first valve A1 is closed, the second valve A2 is closed, and the third valve A3 is opened. The liquid temporarily stored in the flow calibration tank 6 flows back to the feed tank 4 through the second liquid circulation pipe.

[0079] When the liquid quantitative delivery device starts to quantitatively deliver the liquid, the first valve A1 is opened, the second valve A2 is closed, and the third valve A3 is closed. The liquid delivered by the metering pump is discharged to the outside through the discharge pipe 13.

[0080] In some embodiments, the quantitative liquid delivery device also includes a controller. The controller is electrically connected to the first valve A1, and is used to control the opening of the discharge pipe 13 according to the first control signal received from the outside to discharge the liquid to the outside. The controller is also electrically connected to the second valve A2, and is used to control the opening of the first section of the liquid circulation pipe according to the second control signal received from the outside, so that when the flow of the metering pump is calibrated, the liquid pumped by the metering pump is transported to the flow calibration storage tank 6 through the first section of the liquid circulation pipe for temporary storage. The controller is also electrically connected to the third valve A3, and is used to control the opening of the second section of the liquid circulation pipe according to the third control signal received from the outside, so that after the flow of the metering pump is calibrated, the liquid temporarily stored in the flow calibration storage tank 6 is refluxed to the feed storage tank 4 through the second section of the liquid circulation pipe.

[0081] Exemplarily, the first valve A1 , the second valve A2 , and the third valve A3 are all remotely controllable electric valves.

[0082] Exemplarily, the controller may be a general programmable logic controller. The controller may also be arranged in the control cabinet 10.

[0083] Exemplarily, the controller is connected to an external control button, and an operator can send a first control signal, a second control signal, and a third control signal to the controller through the control button.

[0084] Through the above arrangement, the first valve A1, the second valve A2 and the third valve A3 can be controlled respectively by the controller, thereby improving the operating convenience of the operator.

[0085] In the field of nuclear power, the transportation of radioactive liquid has always been a key issue that must be considered in the PUREX water-based spent fuel reprocessing process. Since the liquid produced in the spent fuel reprocessing process is highly toxic and radioactive, and the operating conditions are complex, the liquid transportation-related equipment and pipelines are placed in a concrete structure with multiple layers of shielding, making it difficult for personnel to directly operate and inspect and maintain it. Therefore, the transportation equipment for radioactive liquid generally adopts a maintenance-free or indirectly maintainable method to minimize the radiation level to which personnel are exposed.

[0086] In the uranium tail end section of spent fuel reprocessing, the concentrated uranyl nitrate liquid has the characteristics of high viscosity and easy crystallization at low temperatures. It is crucial to adopt reasonable transportation means to prevent it from crystallizing and clogging equipment and pipelines during the transportation process, and to ensure stable supply of uranium tail end denitrification process continuously and for a long time.

[0087] In some embodiments, the quantitative liquid delivery device is applied to the spent fuel assembly post-processing system, and the above-mentioned liquid is a radioactive liquid. The feed tank 4 is arranged in the first shielding room 20, the flow calibration tank 6 is arranged in the second shielding room 21, the first valve A1, the second valve A2 and the third valve A3 are arranged in the third shielding room 22, and the heating tank 7 and the heating pump 8 are arranged in the equipment room 23. Among the first shielding room 20, the second shielding room 21, the third shielding room 22 and the equipment room 23, the height of the first shielding room 20 is higher than the heights of the other three, and the height of the equipment room 23 is lower than the heights of the other three.

[0088] Exemplarily, the above-mentioned feed liquid is, for example, a concentrated uranyl nitrate feed liquid. At this time, the temperature t2 of the heating medium in the heating component satisfies, 90°C≤t2≤95°C, and the temperature t1 of the concentrated uranyl nitrate feed liquid satisfies, 80°C≤t1≤85°C.

[0089] For example, the temperature t2 of the heating medium in the heating assembly is 90° C., so that the temperature of the concentrated uranyl nitrate solution is stabilized at 85° C., so that the concentrated uranyl nitrate solution remains in a non-crystallized state.

[0090] The size of the feed tank 4 is usually large. By setting the feed tank 4 in an independent first shielding room 20, when designing and constructing the first shielding room 20, only the size of the feed tank 4 needs to be considered, without considering the size of other equipment (such as the flow calibration tank 6, etc.). Therefore, the size of the first shielding room 20 can be set smaller, which is conducive to reducing the difficulty of designing and constructing the first shielding room 20.

[0091] In addition, the capacity of the liquid in the feed tank 4 is large, so the radiation is strong. After the flow calibration tank 6 is separately set in the second shielding room 21, when the operator needs to operate the flow calibration tank 6, the influence of the radiation of the feed tank 4 in the first shielding room 20 on the operator can be avoided.

[0092] By separately arranging the first valve A1, the second valve A2 and the third valve A3 in the third shielding room 22, when the operator needs to enter the third shielding room 22 to operate the first valve A1, the second valve A2 and the third valve A3, the influence of the radiation of the material liquid in the feed tank 4 and the flow calibration tank 6 on the operator can be minimized.

[0093] After the heating tank 7 and the heating pump 8 are arranged in the equipment room 23, when the operator needs to enter the equipment room 23, the radiation effect of the liquid in the feed tank 4 and the flow calibration tank 6 on the operator can be reduced, and the effect of radiation on the operation of the heating tank 7 and the heating pump 8 can be reduced. The height of the equipment room 23 is relatively low, so that the circulation path of the heating medium in the heating assembly is from bottom to top and finally returns to the low point.

[0094] In some examples, the control cabinet 10 is disposed in a maintenance room 19 to prevent radiation from affecting components within the control cabinet 10 .

[0095] In some embodiments, the metering pump is a plunger metering pump. Figure 1 As shown, the metering pump includes a power end 1, a pump core 2 and a hydraulic end 5. The power end 1 is arranged in a maintenance room 19. One end of the pump core 2 is connected to the power end, and the other end of the pump core 2 is connected to the hydraulic end 5 after passing through the shielding plate of the first shielding room 20. The hydraulic end 5 is arranged in a feed tank 4. The power end 1 drives the hydraulic end 5 to move through the pump core 2, so as to pump the liquid through the hydraulic end 5.

[0096] For example, the power end 1 can be a variable frequency motor, or a common motor + reducer. The power end 1 can be connected to the pump core 2 through a cam or a hyperbolic connecting rod structure, so that the pump core 2 drives the hydraulic end 5 to perform work to achieve the pumping of the liquid.

[0097] The length of the pump core 2 can be adjusted according to the actual application scenario to ensure the connection between the power end 1 and the hydraulic end 5 .

[0098] It can be understood that the hydraulic end 5 is immersed below the liquid level of the feed liquid in the feed tank 4.

[0099] The hydraulic end 5 is connected to the pump core 2, and includes a double plunger, a plunger filler, a double check valve, and a liquid inlet and outlet channel; the double plunger setting can ensure the stability of the quantitative delivery process. Since the radioactive liquid contains corrosiveness and radioactivity, the soft sealing materials in the hydraulic end 5 must have acid corrosion resistance and radiation resistance.

[0100] Through the above arrangement, the influence of the radiation in the first shielding room 20 on the power end 1 can be reduced, and the replacement, inspection and maintenance of the power end 1 can be facilitated.

[0101] In some embodiments, the pump core 2 includes an outer sleeve and a connecting rod. One end of the outer sleeve is fixed to the power end, and the other end is fixed to the outer wall of the feed tank 4 after passing through the shielding plate of the first shielding chamber 20. The connecting rod is arranged in the outer sleeve, and the two ends of the connecting rod are respectively connected to the power end 1 and the hydraulic end 5; the power end 1 drives the hydraulic end 5 to move through the connecting rod, so as to pump the liquid through the hydraulic end 5.

[0102] By providing the outer sleeve, it is possible to prevent radioactive radiation from leaking from the gap between the connecting rod and the shielding plate.

[0103] Exemplarily, the feed tank 4 and the metering pump are coupled structures, and the feed tank 4 is a flat top head and an elliptical bottom head structure. The top head of the feed tank 4 is opened, and the hydraulic end 5 of the metering pump extends into the feed tank 4 and is welded to the outer sleeve of the pump core 2.

[0104] For example, when the length of the connecting rod is greater than 2000 mm, the connecting rod may be configured as a structure in which multiple sections of rods are connected, and a locking mechanism (eg, a crosshead structure) is provided between two adjacent rods.

[0105] Through the above arrangement, the connection between the power end 1 and the hydraulic end 5 of the metering pump is achieved.

[0106] In some examples, such as Figure 1 As shown, a bellows 3 is also provided on the outer sleeve, one end of the bellows 3 is fixed on the outer sleeve, and the other end is fixed to the top head opening of the outer wall of the feed tank 4, which is used to absorb the axial thermal displacement of the outer sleeve and the connecting rod.

[0107] The length of the pump core 2 includes the thickness of the top shielding plate of the first shielding room 20, the height of the installation space of the pump core 2 and the partial height of the feed tank 4. The thickness of the shielding plate and the partial height of the feed tank 4 can be adjusted according to the actual radioactivity concentration of the feed liquid and the feed flux. The installation space height of the pump core 2 depends on the welding space between the outer sleeve of the pump core 2 and the top opening of the feed tank 4 and the installation height of the bellows 3 of the outer sleeve of the pump core 2, which is generally not more than 900mm.

[0108] In some examples, part of the pump core 2 is in a maintenance room 19, and a crane 9 and a bag sealing device 11 are also provided in the maintenance room 19. When the pump core 2 needs to be replaced and repaired, the bag sealing device 11 needs to be inspected and repaired.

[0109] In some embodiments, Figure 1 As shown, the liquid quantitative delivery device also includes an emptying assembly. The emptying assembly includes a dilution pipe, a steam jet pump 18 and an emptying pipe 17. The steam jet pump 18 is arranged on the feed tank 4, and the suction port of the steam jet pump 18 is arranged at the bottom of the feed tank 4, which is used to pump the liquid in the feed tank 4 to the outside through the emptying pipe 17. The emptying pipe 17 is connected to the discharge port of the steam jet pump 18, which is used to discharge the liquid pumped by the steam jet pump to the outside.

[0110] Exemplarily, the diluent is a solvent in the feed solution or pure water.

[0111] After the dilution pipe delivers the dilution liquid to the feed tank 4, the proportion of solute in the liquid can be reduced, which is beneficial to increase the fluidity of the liquid and reduce the possibility of crystallization of the liquid, making it easier for the subsequent steam jet pump 18 to pump the liquid to the outside through the emptying pipe 17.

[0112] Exemplarily, the steam jet pump is disposed about 300 mm above the top seal of the feed storage tank 4 .

[0113] The suction port of the steam jet pump 18 is arranged at the bottom of the feed storage tank 4, so that the steam jet pump 18 can empty all or most of the feed liquid in the feed storage tank 4 when it is running.

[0114] Through the above-mentioned arrangement, when the heating component fails and cannot heat the liquid in the liquid quantitative conveying device, or when the metering pump fails, the liquid can be diluted and then discharged through the emptying component to achieve emergency emptying of the liquid, so as to avoid crystallization of the liquid in the liquid quantitative conveying device and blockage of the equipment (such as the feed storage tank 4) or pipeline.

[0115] In summary, the quantitative liquid conveying device provided in the embodiment of the present invention improves the reliability of radioactive liquid conveying in terms of conveying equipment design, equipment pipeline layout, inspection and maintenance methods, etc.

[0116] Embodiment 2:

[0117] The embodiment of the present invention further provides a method for quantitatively conveying a radioactive liquid. The method for quantitatively conveying a radioactive liquid uses the device for quantitatively conveying a liquid in Embodiment 1. The method for quantitatively conveying a liquid includes steps S100-S500.

[0118] S100, start the heating component to heat the feed liquid in the feed tank 4, the discharge pipe 13, the feed liquid circulation pipe 12, and the flow calibration tank 6.

[0119] Exemplarily, the feed liquid is concentrated uranyl nitrate feed liquid. The temperature t2 of the heating medium in the heating component satisfies 90°C≤t2≤95°C, for example, the temperature t2 of the heating medium is 90°C, 92°C or 95°C.

[0120] By heating the heating component, the temperature t1 of the feed liquid satisfies 80°C≤t1≤85°C. The temperature t1 of the feed liquid is 80°C, 82°C or 85°C.

[0121] In this way, the liquid feed can be maintained above the crystallization temperature, and the liquid feed can be kept in a non-crystallized state, so as to facilitate the transportation of the liquid feed and avoid the liquid feed crystallization from clogging the liquid feed quantitative transportation device.

[0122] S200, the metering pump is operated for the first time, so that the liquid in the feed tank 4 is pumped to the flow calibration tank 6 for temporary storage through the liquid circulation pipe 12; the volume of the liquid pumped by the metering pump in the first time is obtained through the liquid level meter in the feed tank 4 to calibrate the flow of the metering pump.

[0123] The flow rate of the metering pump can be obtained by dividing the volume of the liquid pumped by the metering pump by the first time, thus completing the calibration of the flow rate of the metering pump.

[0124] S300, returning the liquid temporarily stored in the flow calibration storage tank 6 to the feed storage tank 4.

[0125] S400, calculating a second time for which the metering pump needs to operate according to a first volume of the liquid that needs to be delivered by the liquid quantitative delivery device.

[0126] The second time the metering pump needs to run can be obtained by dividing the first capacity by the flow rate of the metering pump.

[0127] S500 , the metering pump runs for a second time to discharge a preset volume of liquid through the discharge pipe 13 .

[0128] After the flow rate calibration of the metering pump is completed, the metering pump can be made to deliver the first volume of liquid to the outside through the second time of the metering pump operation, thereby realizing quantitative delivery of the liquid.

[0129] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A liquid quantitative delivery device, characterized in that: include: A feed storage tank (4) for storing feed liquid; A metering pump, arranged on the feed tank (4), for pumping the feed liquid; A discharge pipe (13), connected to the metering pump, for discharging the liquid in the feed tank (4); A flow calibration component, used for calibrating the flow of the metering pump to determine the set running time of the metering pump; the flow calibration component comprises a liquid level meter, a liquid circulation pipe (12) and a flow calibration storage tank (6); the liquid level meter is arranged in the feed storage tank (4) and is used to detect the liquid level of the liquid in the feed storage tank (4); one end of the liquid circulation pipe (12) is connected to the discharge pipe (13), and the other end is connected to the inside of the feed storage tank (4); the flow calibration storage tank (6) is arranged on the liquid circulation pipe (12) and is used to temporarily store the liquid pumped by the metering pump when calibrating the flow of the metering pump, and to return the temporarily stored liquid to the feed storage tank (4) after the calibration is completed; and, A heating component, used for heating the feed liquid in the feed tank (4), the discharge pipe (13), the feed liquid circulation pipe (12), and the flow calibration tank (6); After the flow calibration of the metering pump is completed, the metering pump operates according to the set operating time, so that the liquid quantitative conveying device pumps a preset volume of liquid through the discharge pipe (13).

2. The liquid quantitative delivery device according to claim 1, characterized in that: The heating assembly comprises: A plurality of heat-insulating jackets are respectively arranged on the outside of the feed tank (4), the discharge pipe (13), the liquid circulation pipe (12), and the flow calibration tank (6); A heating tank (7) is connected to the heat-insulating jacket via a connecting pipe (15) and is used to heat the heating medium in the heating tank (7); and, A heating pump (8) is provided on the connecting pipe (15) and is used to transport the heating medium in the heating tank (7) to each of the thermal insulation jackets, so as to heat the feed liquid in the feed tank (4), the discharge pipe (13), the feed liquid circulation pipe (12), and the flow calibration tank (6) respectively through the heating medium.

3. The liquid quantitative delivery device according to claim 2, characterized in that: Each of the heat-insulating jackets has a liquid return port, and the liquid return ports are connected to the heating tank (7); After the heating medium is transported into each of the heat-insulating jackets, it flows back into the heating tank (7) from the liquid return port of each of the heat-insulating jackets.

4. The liquid quantitative conveying device according to claim 2, characterized in that: The flow calibration storage tank (6) is also provided with an overflow pipe (14), a first end of the overflow pipe (14) is communicated with the upper part of the flow calibration storage tank (6), and a second end of the overflow pipe (14) is communicated with the liquid circulation pipe 12 located between the flow calibration storage tank (6) and the feed storage tank (4); The plurality of thermal insulation jackets are also arranged outside the overflow pipe (14); the heating pump (8) is also used to transport the heating medium to the thermal insulation jacket outside the overflow pipe (14), so as to heat the liquid in the overflow pipe (14) through the heating medium.

5. The liquid quantitative conveying device according to claim 2, characterized in that: Also includes a computing unit; The calculation unit is electrically connected to the liquid level meter, and is used to obtain the total amount of liquid pumped by the metering pump according to the liquid level change of the liquid level meter during the process of calibrating the flow rate of the metering pump, and calculate the flow rate of the metering pump in combination with the running time of the metering pump, and calculate the set running time of the metering pump according to the preset capacity of the liquid to be pumped by the liquid quantitative conveying device and the flow rate of the metering pump.

6. The liquid quantitative conveying device according to claim 2, characterized in that: Also included is a valve assembly; The valve assembly comprises a first valve, a second valve and a third valve; the first valve is arranged on the discharge pipe (13) and located at the rear end of the liquid feed circulation pipe (12), and is used to control the on-off of the discharge pipe (13); the second valve is arranged on the first section of the liquid feed circulation pipe, the first section of the liquid feed circulation pipe is located between the flow calibration storage tank (6) and the discharge pipe (13), and the second valve is used to control the on-off of the first section of the liquid feed circulation pipe; the third valve is arranged on the second section of the liquid feed circulation pipe, the second section of the liquid feed circulation pipe is located between the flow calibration storage tank (6) and the feed storage tank (4), and the third valve is used to control the on-off of the second section of the liquid feed circulation pipe; The plurality of thermal insulation jackets are also arranged on the outside of the first valve, the second valve and the third valve, and the heating pump (8) is also used to transport the heating medium to the thermal insulation jackets on the outside of the first valve, the second valve and the third valve, so as to heat the liquid in the first valve, the second valve and the third valve respectively through the heating medium.

7. The liquid quantitative delivery device according to claim 6, characterized in that: Also includes a controller; The controller is electrically connected to the first valve and is used to control the discharge pipe (13) to open according to the received first control signal so as to discharge the liquid to the outside; The controller is also electrically connected to the second valve, and is used to control the opening of the first section of the liquid circulation pipe according to the received second control signal, so that when the flow of the metering pump is calibrated, the liquid pumped by the metering pump is transported to the flow calibration storage tank (6) through the first section of the liquid circulation pipe for temporary storage; The controller is also electrically connected to the third valve and is used to control the opening of the second section of the liquid circulation pipe according to the received third control signal, so that after the flow calibration of the metering pump is completed, the liquid temporarily stored in the flow calibration tank (6) can flow back to the feed tank (4) through the second section of the liquid circulation pipe.

8. The liquid quantitative conveying device according to claim 6, characterized in that: The feed liquid is a radioactive feed liquid; The feed storage tank (4) is arranged in a first shielding room (20), the flow calibration storage tank (6) is arranged in a second shielding room (21), the first valve, the second valve and the third valve are arranged in a third shielding room (22), and the heating tank (7) and the heating pump (8) are arranged in an equipment room (23); Among the first shielding room (20), the second shielding room (21), the third shielding room (22) and the equipment room (23), the height of the first shielding room (20) is higher than the heights of the other three, and the height of the equipment room (23) is lower than the heights of the other three.

9. The liquid quantitative delivery device according to claim 8, characterized in that: The metering pump is a plunger type metering pump; The metering pump comprises: A power end (1) is arranged in a maintenance room (19); A pump core (2), one end of which is connected to the power end, and the other end of which is connected to the hydraulic end (5) after passing through the shielding plate of the first shielding chamber (20); and, A hydraulic end (5) is arranged in the feed tank (4); The power end (1) drives the hydraulic end (5) to move through the pump core (2), so as to pump the liquid through the hydraulic end (5).

10. The liquid quantitative conveying device according to claim 9, characterized in that: The pump core (2) comprises: an outer sleeve, one end of which is fixed to the power end, and the other end of which passes through the shielding plate of the first shielding room (20) and is fixed to the outer wall of the feed tank (4); and, A connecting rod is arranged in the outer sleeve, and the two ends of the connecting rod are respectively connected to the power end (1) and the hydraulic end (5); the power end (1) drives the hydraulic end (5) to move through the connecting rod, so as to pump the liquid through the hydraulic end (5).

11. The liquid quantitative conveying device according to claim 8, characterized in that: Also included is an emptying assembly; The emptying assembly comprises: a dilution pipe, connected to the interior of the feed storage tank (4), and used for conveying dilution liquid into the feed storage tank (4); a steam jet pump (18) disposed on the feed storage tank (4), wherein the suction port of the steam jet pump (18) is disposed at the bottom of the feed storage tank (4) and is used to pump the feed liquid in the feed storage tank (4) to the outside through the emptying pipe (17); and, The emptying pipe (17) is connected to the discharge port of the steam jet pump (18) and is used to discharge the liquid pumped by the steam jet pump (18) to the outside.

12. A method for quantitatively transporting a radioactive liquid, characterized in that: Using the liquid quantitative delivery device according to any one of claims 1 to 11, the liquid quantitative delivery method comprises: The heating component is started to heat the feed liquid in the feed tank (4), the discharge pipe (13), the feed liquid circulation pipe (12), and the flow calibration tank (6); The metering pump is operated for a first time, so that the liquid in the feed storage tank (4) is pumped to the flow calibration storage tank (6) for temporary storage through the liquid circulation pipe (12); the volume of the liquid pumped by the metering pump during the first time is obtained through the liquid level meter in the feed storage tank (4) to calibrate the flow of the metering pump; The liquid temporarily stored in the flow calibration storage tank (6) is made to flow back into the feed storage tank (4); Calculating a second time for the metering pump to run according to a first volume of the liquid that needs to be delivered by the liquid quantitative delivery device; The metering pump operates for a second time to discharge a preset volume of liquid through the discharge pipe (13).

13. The method for quantitatively transporting radioactive liquid according to claim 12, characterized in that: The temperature t1 of the feed liquid satisfies 80°C≤t1≤85°C.

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